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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6708fdeaee9ee41d5378d0c4534e7d87772383c339710cdb08004f8bbad426e6' 
  AND token = 'IZ3YQsz4Ir1idOtNKzn6hZY7fytlxR/vxnEfXyKWzGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}